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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 12.5 years, and standard deviation of 3.7 years. If you

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 12.5 years, and standard deviation of 3.7 years.

If you randomly purchase 8 items, what is the probability that their mean life will be longer than 14 years?

(using excel)

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